This is a 1990 Audi 80 quattro, the follow-on model to the 4000 quattro and even rarer due to the bogus Audi "unintended acceleration" thing in the late '80's.
The car is pretty close to stock right now, other than a few suspension mods. But that's going to change soon, as it'll getting a lot of the upgrades from the 4000, probably in the spring of 2012.